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Answer :
Final answer:
The allergen that causes hay fever and is transmitted through physical contact is seasonal allergen.
Explanation:
The allergen that causes hay fever and is transmitted through physical contact is seasonal allergen. Seasonal allergens include pollen from grasses, trees, and weeds, which are typically spread through the air and can come into contact with a person's skin.
The allergen responsible for hay fever is a seasonal allergen, which mainly consists of pollen from trees, grasses, and weeds. These are airborne allergens and not usually transmitted through physical contact. These allergens enter our body through the air we breathe, particularly in specific seasons, commonly spring and fall.
Hay fever, also known as allergic rhinitis, is an example of a Type I hypersensitivity reaction. The first exposure to this allergen results in an immune response where the body produces allergen-specific Immunoglobulin E (IgE) antibodies, a process known as sensitization. These IgE antibodies attach themselves to mast cells found in body tissues, especially nasal passages. When the same allergen is encountered again, it binds to the IgE on the mast cells, triggering these cells to release chemicals like histamines. Histamines cause the typical allergy symptoms such as a runny nose, watery eyes, and sneezing.
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